[Ada] Preserve unchecked conversion of string constant

This makes it possible to pass the result to a C function directly.

gcc/ada/

	* gcc-interface/utils.cc (unchecked_convert): Do not fold a string
	constant if the target type is pointer to character.

diff --git a/gcc/ada/gcc-interface/utils.cc b/gcc/ada/gcc-interface/utils.cc
index 5722ed2611db8e3f3fc1f7689ab543c5dacbd708..98bcb7063e33358889e8c39b9ff31e8804605248 100644 (file)
--- a/gcc/ada/gcc-interface/utils.cc
+++ b/gcc/ada/gcc-interface/utils.cc
@@ -5637,6 +5637,13 @@ unchecked_convert (tree type, tree expr, bool notrunc_p)
       return unchecked_convert (type, expr, notrunc_p);
     }
 
+  /* If we are converting a string constant to a pointer to character, make
+     sure that the string is not folded into an integer constant.  */
+  else if (TREE_CODE (expr) == STRING_CST
+          && POINTER_TYPE_P (type)
+          && TYPE_STRING_FLAG (TREE_TYPE (type)))
+    expr = build1 (VIEW_CONVERT_EXPR, type, expr);
+
   /* Otherwise, just build a VIEW_CONVERT_EXPR of the expression.  */
   else
     {